Nick, Neave, David and Vaidev paid a total of $225 for a souvenir. Vaidev paid ⁴₅ of what the rest paid. Nick paid 25% of what the rest paid. Neave and David paid an equal amount of money. How much did David pay?

Nick	Neave	David	Vaidev	Total
5x5			4x5	9x5
1x9	4x9			5x9
	1	1
9 u	8 u	8 u	20 u	45 u

25%= ²⁵₁₀₀= ¹₄
Nick's share : Total share = 1 : 4

The total amount paid for the souvenir is repeated.  Make the total amount the same.  LCM of 9 and 5 is 45.

Amount that Neave, David and Vaidev paid = 36 u

Amount that Neave and David paid
= 36 u - 20 u
= 16 u

The amount that Neave and David each paid is the same.

Amount that Neave and David each paid
= 16 u ÷ 2
= 8 u

Cost of the souvenir = 45 u

45 u = 225

1 u = 225 ÷ 45 = 5

Amount that David paid
= 8 u
= 8 x 5
= $40

Answer(s): $40